四章-29-实现一个简单标记
2020-04-20 本文已影响0人
彩云飘过
本文基于腾讯课堂老胡的课《跟我学Openlayers--基础实例详解》做的学习笔记，使用的openlayers 5.3.x api。
源码 见 1029.html ，对应的 官网示例 https://openlayers.org/en/latest/examples/icon.html?q=style
https://openlayers.org/en/latest/examples/icon.html?q=style
https://openlayers.org/en/latest/examples/icon-negative.html?q=style
image.png
<!DOCTYPE html>
<html>
<head>
<title></title>
<link rel="stylesheet" href="../include/ol.css" type="text/css">
<link rel="stylesheet" href="../include/bootstrap.css" type="text/css">
<script src="../include/ol.js"></script>
<script src="../include/jquery.js"></script>
<script src="../include/bootstrap.min.js"></script>
</head>
<body>
<div id="popup" style="width:40px"></div>
<div id="map" class="map"></div>
<script>
var iconFeature = new ol.Feature({
geometry: new ol.geom.Point([0, 0]),
name: '虚无岛',
population: 4000,
rainfall: 500
});
var iconStyle = new ol.style.Style({
image: new ol.style.Icon(({
anchor: [0.5, 46],
anchorXUnits: 'fraction',
anchorYUnits: 'pixels',
src: '../data/icon.png'
}))
});
iconFeature.setStyle(iconStyle);
var vectorSource = new ol.source.Vector({
features: [iconFeature]
});
var vectorLayer = new ol.layer.Vector({
source: vectorSource
});
var rasterLayer = new ol.layer.Tile({
source: new ol.source.TileJSON({
url: 'https://api.tiles.mapbox.com/v4/mapbox.geography-class.json?secure&access_token=pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2pzbmg0Nmk5MGF5NzQzbzRnbDNoeHJrbiJ9.7_-_gL8ur7ZtEiNwRfCy7Q',
crossOrigin: ''
})
});
var map = new ol.Map({
layers: [rasterLayer, vectorLayer],
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 3
})
});
var element = document.getElementById('popup');
var popup = new ol.Overlay({
element: element,
positioning: 'bottom-center',
stopEvent: false,
offset: [0, -50]
});
map.addOverlay(popup);
//当单击地图时，弹框Overlay，显示要素名称
map.on('click', function (evt) {
var feature = map.forEachFeatureAtPixel(evt.pixel,
function (feature) {
return feature;
});
if (feature) {
var coordinates = feature.getGeometry().getCoordinates();
popup.setPosition(coordinates);
$(element).popover({
title: "信息:",
placement: 'top',
html: true,
content: '<div style="width:50px">' + feature.get('name') + '</div>'
});
$(element).popover('show');
} else {
$(element).popover('destroy');
}
});
//以下用在触摸屏，当手指离开屏幕时，弹框消失
map.on('pointermove', function (e) {
if (e.dragging) {
$(element).popover('destroy');
return;
}
var pixel = map.getEventPixel(e.originalEvent);
var hit = map.hasFeatureAtPixel(pixel);
map.getTarget().style.cursor = hit ? 'pointer' : '';
});
</script>
</body>
</html>
